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MathGroup Archive 2000

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Demonstrate that 1==-1

  • To: mathgroup at
  • Subject: [mg23171] Demonstrate that 1==-1
  • From: "Alberto Verga" <verga at>
  • Date: Thu, 20 Apr 2000 23:48:43 -0400 (EDT)
  • Organization: Universite de la Mediterranee Aix en Provence
  • Sender: owner-wri-mathgroup at

Integrate[(1 + a/E^(I*u))/(-1 + a/E^(I*u)), {u, 0, 2*Pi}]

Mathematica gives -2Pi

Now multiply the numerator and the denominator by -1

Integrate[(-1 - a/E^(I*u))/(1 - a/E^(I*u)), {u, 0, 2*Pi}]

Mathematica gets 2*Pi

This is only possible if 1==-1

Is this another bug in Limit?

Alberto Verga
irphe - Marseille

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